\begin{table}[ht]
\caption{Background characteristics of estimation sample by college enrollment status}
\label{tab:sumStatsPost}
\centering
\begin{threeparttable}
\begin{tabular}{lcccc}
\toprule 
Blue Collar Non-Grad. & White Collar Non-Grad. & Blue Collar Grad. & White Collar Grad. \\
Blue Collar Non-Grad. & White Collar Non-Grad. & Blue Collar Grad. & White Collar Grad. \\
                               & \multicolumn{2}{c}{Non-graduates} & \multicolumn{2}{c}{Graduates} \\ \cmidrule(r){2-3}\cmidrule(l){4-5} 
                               & Blue Collar & White Collar & Blue Collar & White Collar \\
\midrule 
Age (years)    & 24.813 & 26.116 & 27.982 & 28.399 \\ 
     & (4.434) & (4.319) & (3.281) & (3.184) \\ 
Black     & 0.210 & 0.169 & 0.135 & 0.138 \\ 
     & (0.407) & (0.375) & (0.342) & (0.345) \\ 
Hispanic   & 0.197 & 0.193 & 0.112 & 0.086 \\ 
   & (0.398) & (0.395) & (0.316) & (0.281) \\ 
SAT Math     &  456 &  488 &  519 &  569 \\ 
     & (95) & (96) & (110) & (105) \\ 
SAT Verbal   &  422 &  465 &  474 &  531 \\ 
   & (111) & (114) & (151) & (148) \\ 
High School GPA (z-score)  & -0.164 & 0.098 & 0.545 & 0.855 \\ 
  & (0.784) & (0.785) & (0.745) & (0.686 ) \\ 
Parent Graduated College   & 0.188 & 0.378 & 0.589 & 0.619 \\ 
   & (0.391) & (0.485) & (0.492) & (0.486) \\ 
Family Income (\$1996) (000's)   & 44.446 & 54.656 & 63.502 & 78.175 \\ 
  & (36.038) & (40.788) & (43.021) & (52.497) \\ 
Observations   &  11,631 &   1,168 &     953 &   1,185 \\ 
Share Conditional on Graduation Outcome   & 0.909 & 0.091 & 0.446 & 0.554 \\ 
\bottomrule 
\end{tabular} 
\end{threeparttable} 
\end{table} 
